WO1998044605A1 - Amplificateur optique - Google Patents

Amplificateur optique Download PDF

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Publication number
WO1998044605A1
WO1998044605A1 PCT/JP1998/001488 JP9801488W WO9844605A1 WO 1998044605 A1 WO1998044605 A1 WO 1998044605A1 JP 9801488 W JP9801488 W JP 9801488W WO 9844605 A1 WO9844605 A1 WO 9844605A1
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WO
WIPO (PCT)
Prior art keywords
signal light
optical
port
output
light
Prior art date
Application number
PCT/JP1998/001488
Other languages
English (en)
Japanese (ja)
Inventor
Yoshio Tashiro
Haruki Ogoshi
Original Assignee
The Furukawa Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Furukawa Electric Co., Ltd. filed Critical The Furukawa Electric Co., Ltd.
Priority to CA002257097A priority Critical patent/CA2257097A1/fr
Priority to EP98911143A priority patent/EP0935320A1/fr
Publication of WO1998044605A1 publication Critical patent/WO1998044605A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S2301/00—Functional characteristics
    • H01S2301/04—Gain spectral shaping, flattening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06787—Bidirectional amplifier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/003—Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators

Definitions

  • the present invention relates to an optical amplifier for amplifying an optical signal in various optical communication systems, and is particularly suitable for use in wavelength division multiplexed optical communication.
  • a regenerative repeater that converts an optical signal into an electric signal, amplifies the signal, and then outputs the signal again as an optical signal is used.
  • an optical fiber amplifier that directly amplifies the optical signal has been used.
  • EDFA erbium-doped optical fiber optical amplifier
  • WDM wavelength division multiplexing optical communication
  • Wavelength-division multiplexing optical communication uses signal light of a plurality of different wavelengths, carries information on each light, multiplexes them with a wavelength-multiplexing demultiplexer, and transmits them as wavelength-division multiplexed signal light through an optical fiber. Yes, it is possible to greatly increase the communication capacity per fiber compared to conventional optical communication using only one light.
  • the EDFA can amplify WDM wavelength-division multiplexed signal light in a lump, and is expected to be a simple linear repeater replacing conventional regenerative repeaters in WDM systems. There are also issues that need to be resolved for use in WDM systems.
  • the EDFA excites erbium ions in the EDF by passing excitation light of a predetermined wavelength through an erbium-doped fiber (EDF), and the electron reaction in the EDF. A translocation state is created, the signal light is passed through the EDF in the inverted distribution state, and light having the same wavelength as the signal light is stimulated to emit to amplify the passing signal light.
  • EDF erbium-doped fiber
  • the gain characteristic of each wavelength (channel) has a gain deviation between channels due to the EDF absorption coefficient, stimulated emission coefficient, population inversion, etc., and changes in population inversion due to changes in the intensity of the input signal light.
  • the signal light output from the EDFA may have a difference in intensity depending on the wavelength. is there. That is, the gain of the EDFA has wavelength dependence. Therefore, when the EDF A is connected in multiple stages as a linear repeater, the gain difference between wavelengths is accumulated and increased, causing a greater problem and limiting the transmission characteristics of the system.
  • the fiber gratings B 1, B 2,... ⁇ selectively reflect wavelengths 1 and 2 ' ⁇ and are input to the first port 1 of the optical circuit ⁇ .
  • the light reflected by the fiber gratings B1, ⁇ 2, ⁇ , ⁇ is emitted from the third port 3.
  • Japanese Patent Application Laid-Open No. 7-226650 discloses an optical amplifier suitable for wavelength division multiplexing communication combining an optical circuit and wavelength selective reflection means. This optical amplifier is not shown in the second port (2) of the optical circuit, which has three ports (1), (2), and (3) as shown in Fig. 9, and is amplified by the pump light from the pump light source.
  • a fiber C is connected, a wavelength-selective reflection means D for reflecting signal light is inserted in the middle of the fiber C in the longitudinal direction, and is input from the signal light input port E, amplified by the optical amplification fiber C, and The signal light reflected by the above wavelength-selective reflection means is output from the signal light output port F.
  • the reflection means D since a deviation force s corresponding to the wavelength is generated in the gain of each signal light spread by the optical amplification fiber C, the reflection means D is provided independently for each signal light, and these reflection means D are provided by the optical amplification fibers.
  • the gain of the signal light output from the signal light output port F is made uniform by distributing along the longitudinal direction of C and making the amplification distance of each signal light different so as to eliminate the difference in gain. So that they can be aligned.
  • each fiber grating Bl, B2, Bn distributed in the optical amplification fiber C is changed, so that each signal light in the optical amplification fiber C is changed.
  • the final output level can be made uniform by changing the propagation distance.However, in the configuration in which the fiber gratings B1, ⁇ 2, Therefore, noise characteristics may be degraded due to multiple reflection of signal light.
  • a correction filter for flattening the gain spectrum is inserted into an optical fiber amplifier such as an EDF to eliminate the intensity deviation between signal lights.
  • an optical fiber amplifier such as an EDF
  • parts such as fiber gratings need to be replaced, which requires a great deal of time for setting during optical amplifier production, maintenance after manufacturing, and changing settings. Disclosure of the invention
  • An object of the present invention is to provide an optical amplifier that can easily perform this adjustment when obtaining an output without deviation.
  • the invention according to claim 1 of the present invention is characterized in that the signal light input to the signal light input port is input to an optical amplification fiber, is pumped by pump light, and has an optical amplification operation by stimulated emission.
  • an optical circuit having at least three ports between the signal light input port and the signal light output port.
  • the light input to the first port is inserted from the second port and the light input to the second port is output from the third port.
  • the second port is connected to a reflection means for reflecting and returning the light emitted from the port, and the reflection means is used to reflect each of two or more signal lights having different wavelengths input from the signal light input port.
  • the optical circule to which the reflection means is connected is inserted before, after, or in the middle of the optical amplification fiber.
  • the invention according to claim 3 of the present invention is the optical amplifier according to claim 1, wherein the optical circuit and the reflection means are connected to each other by an optical connector and are detachable.
  • the invention according to claim 4 of the present invention is the optical amplifier according to claim 2, wherein the optical circuit and the reflection means are connected to each other by an optical connector and are detachable.
  • the invention of claim 5 of the present invention is characterized in that the second port of the optical circuit has at least one input port and two or more output boats, and the light incident on the input boat is 2 Switching means capable of switching to one of the above-mentioned output ports and emitting light is connected, and each output port of the switching means has reflecting means having different characteristics for reflecting signal light input to the signal light input port.
  • each reflecting means reflects predetermined signal light, outputs the signal light from a signal light output port, and has a reflection characteristic such that a light intensity deviation between two or more signal lights output is reduced.
  • the optical amplifier according to item 1 wherein The invention according to claim 6 of the present invention is characterized in that the second port of the optical circuit has at least one input port and two or more output ports, and the light incident on the input port is Switching means capable of switching to a desired one of two or more output ports and emitting light is connected, and each output port of the switching means has a different characteristic of reflecting signal light input to the signal light input port.
  • each reflecting means reflects predetermined signal light, outputs the signal light from a signal light output port, and has a reflection characteristic such that a light intensity deviation between two or more signal lights output is reduced.
  • An optical amplifier according to claim 2 having the same.
  • the invention according to claim 7 of the present invention monitors the signal light from the signal light input to the signal light input port or the signal light propagated between the signal light input port and the signal light output port.
  • a signal light monitor for detecting the wavelength arrangement, the light intensity for each wavelength, and the like, and a switching means for switching and controlling the output port of the switching means based on the information of the signal light detected by the signal light monitor.
  • An optical amplifier according to claim 5, comprising: The invention according to claim 8 of the present invention monitors the signal light from the signal light input to the signal light input port or the signal light propagated between the signal light input port and the signal light output port.
  • a signal light monitor for detecting the wavelength arrangement, the light intensity for each wavelength, and the like; and a switching means for switching and controlling the output port of the switching means based on information of the signal light detected by the signal light monitor.
  • the invention according to claim 9 of the present invention is the optical amplifier according to claim 5, wherein the optical circulator and the switching means are detachably connected to each other by an optical connector.
  • the invention according to claim 10 of the present invention is the optical amplifier according to claim 6, wherein the optical circuit and the switching means are detachably connected to each other by an optical connector.
  • the invention according to claim 11 of the present invention is the optical amplifier according to claim 7, wherein the optical circuit and the switching means are detachably connected by an optical connector.
  • the invention according to claim 12 of the present invention is the optical amplifier according to claim 8, wherein the optical circuit and the switching means are detachably connected by an optical connector.
  • the invention according to claim 13 of the present invention is characterized in that at least one of the reflection means connected to each output port of the switching means has a combination of the selective reflection wavelengths and a selection of another reflection means. 6.
  • the combination of at least one of the reflection means connected to each output port of the switching means and the selective reflection wavelength is the other reflection means.
  • the invention according to claim 15 of the present invention is characterized in that the combination of at least one of the reflection means connected to each output port of the switching means and the selective reflection wavelength is the other reflection means.
  • the invention according to claim 16 of the present invention is characterized in that at least one of the reflection means connected to each output port of the switching means has a combination of the selective reflection wavelengths and a selection of another reflection means.
  • the optical amplifier according to claim 8 which is different from a combination of wavelengths.
  • the invention of claim 17 of the present invention is characterized in that at least one of the reflection means connected to each output port of the switching means has a combination of selective reflection wavelengths. 10.
  • the optical amplifier according to claim 9, wherein the optical amplifier is different from a combination of wavelengths selected by other reflection means.
  • the invention according to claim 18 of the present invention is characterized in that the combination of at least one of the reflection means connected to each output port of the switching means is selected by the other reflection means.
  • the optical amplifier according to claim 10 wherein the optical amplifier is different from a combination of wavelengths.
  • the invention according to claim 19 of the present invention is characterized in that at least one of the reflection means connected to each output port of the switching means has a combination of the selective reflection wavelengths and a selection of another reflection means. 11.
  • the invention of claim 20 of the present invention is characterized in that at least one of the reflection means connected to each output port of the switching means has a combination of a power selective reflection wavelength and a selection of another reflection means. 13.
  • the optical amplifier according to claim 12 which is different from a combination of wavelengths.
  • the invention of claim 21 of the present invention is the optical amplifier according to any one of claims 1 to 20 of the present invention, wherein the reflection means includes fiber grating.
  • FIG. 1 is a schematic diagram showing a first embodiment of the optical amplifier of the present invention.
  • FIG. 2 is a schematic diagram showing a second embodiment of the optical amplifier of the present invention.
  • FIG. 3 is a schematic diagram showing a third embodiment of the optical amplifier of the present invention.
  • FIG. 4 is a schematic diagram showing a fourth embodiment of the optical amplifier of the present invention.
  • FIG. 5 is a schematic view showing a fifth embodiment of the optical amplifier of the present invention.
  • FIG. 6 is a schematic diagram showing a sixth embodiment of the optical amplifier of the present invention.
  • Fig. 7 is an explanatory diagram showing an example of the characteristics of a fiber grating.
  • Fig. 8 is a schematic diagram of a wavelength selection filter using a conventional optical filter.
  • Fig. 9 is a schematic diagram of an optical amplifier used for conventional WDM communication.
  • FIG. 1 shows an optical amplifier according to a first embodiment of the present invention.
  • the optical amplifier (EDFA) in Fig. 1 consists of a signal light input port 1, optical isolators 13a and 13b, wavelength multi-wavelength optical devices 14a and 14b, excitation light sources 15a and 15b, and erpium addition.
  • each pump light source 15a, 15b is driven and the pump light is injected into the erbium-doped optical fibers 2a, 2b
  • these fibers 2a, 2b have an optical amplification function
  • the wavelength multiplexed signal light input to the signal light input port 1 and output from the signal light output port 3 can be optically amplified by the optical amplification fibers 2a and 2b.
  • the fiber grating 8 can selectively reflect two or more light beams having a desired wavelength selectively, and can set a desired reflectance Rn for each wavelength light. Only the desired wavelength light can be selected from the propagated light and propagated to the erbium-doped optical fiber 2b, and the light intensity of each wavelength light propagated to the erbium-doped optical fiber 2b can be individually adjusted. It is as follows. Note that the specific wavelength light refers to an optical signal relayed by the present optical amplifier, the desired reflectance Rn is the reflectance for each signal light relayed, and in the present invention, the intensity deviation at the signal light output board 3 Is determined to be eliminated. An example of a method of setting the reflection rate Rn will be described below.
  • FIG. 2 shows a second embodiment of the optical amplifier of the present invention.
  • the second embodiment of the optical amplifier shown in FIG. 1 has different characteristics via the optical switching means 11 to the second port 6 of the optical amplifier 4.
  • Four fiber gratings 8 (8a, 8b, 8c, 8d) are connected.
  • the fiber grating 8 connected to the second port 6 of the optical circuit 4 by the same optical switching means 11 a, 8b, 8c, and 8d can be easily switched.
  • the optical switching means 11 has one input port (also an output port) 9 on the side connected to the second port 6 of the optical circuit 4 and four output ports on the opposite side.
  • One (also an input port) 10a, 10b, 10c, and 10d are provided, and an input switch 9 and four output boats 10a and 1 are provided by an operation switch (not shown).
  • 0b, 10G, and 10d can be optically connected to a desired one.
  • the optical switching means 11 receives the signal light output from the second port 6 of the optical circuit 4, and connects the fiber gratings 8a, 8b, 8c, 8d to a desired one.
  • the signals can be output to ports 10a to 10d, and the signals output from ports 10a to 10d are reflected by fiber gratings 8a, 8b, 8c, and 8d and input. Light can be input to the second port 6 of the optical circuit 4.
  • Each of the fiber gratings 8a, 8b, 8c, 8d connected to the optical switching means 11 has a different reflection characteristic, and the signal light input to the signal input port 1 8a, 8b, 8c and 8 are reflected by one " ⁇ " and output from the signal output port 3.
  • FIG. 7 shows the reflection of the fiber gratings 8a, 8b, 8c and 8d.
  • the fiber grating 8a has a high reflectivity on the short wavelength side and a low reflectivity on the long wavelength side
  • the fiber bag grating 8d has a high reflectivity on the short wavelength side.
  • the fiber gratings 8b and 8c have low reflectivity and high reflectivity on the long wavelength side, and have intermediate reflection characteristics.
  • the selection of gratings 8a, 8b, 8c, and 8d is determined by the characteristics of the input wavelength-multiplexed signal light (the intensity of each input signal channel, the total intensity, wavelength arrangement, number of channels, etc.). For example, according to the intensity of each wavelength light of the input wavelength multiplexed signal light, the selection may be made based on a predetermined criterion, or according to the change in the combination of the channel wavelengths of the wavelength multiplexed signal light, The selection may be made based on a predetermined criterion. In the former example, when the wavelength light on the short wavelength side is at a high level and the wavelength light on the long wavelength side is at a low level, the level deviation can be reduced by selecting the fiber grating 8d shown in FIG.
  • the number of fiber gratings 8 and the number of output ports 10 in the optical switching means 11 are not limited to the example of the present embodiment.According to this configuration example, if a plurality of fiber gratings 8 are provided in advance, parts The characteristics of the amplifier can be changed without replacement of the amplifier.
  • a fiber grating 8 having a different combination of selective reflection wavelengths to each output port 10 of the switching means 11, for example, as shown in FIG.
  • a fiber bug rating 8e corresponding to the signal light of 8 channels may be attached. In this case, it is easy to deal with increasing the transmission capacity by increasing the number of channels from four to eight.
  • FIG. 3 shows a third embodiment of the optical amplifier according to the present invention, in which the optical connector 12 is interposed in the second port 6 of the optical amplifier 4 of the optical amplifier shown in FIG. 8a, 8b, 8c, 8d).
  • one of the optical connectors 12 male connector or female connector
  • Connect 1b to fiber gratings 8a, 8b, 8c, and 8d Connect 1b to fiber gratings 8a, 8b, 8c, and 8d, and connect the other end (female connector or male connector) of fiber connector 12a to fiber gratings.
  • Various fiber gratings 8a, 8b, 8c, 8d having different characteristics can be easily attached to and detached from the second port 6.
  • the characteristics of the fiber gratings 8a, 8b, 8c, 8d to be connected are determined, for example, by the input signal characteristics. For example, the selection may be made according to the intensity of each channel of the input signal, or may be selected according to a change in the combination of the channel wavelengths of the wavelength division multiplexed signal. With this configuration example, the characteristics of the amplifier can be easily changed simply by replacing the fiber gratings 8a, 8b, 8c, and 8d.
  • FIG. 4 shows a fourth embodiment of the optical amplifier according to the present invention.
  • a signal light monitor 18 for monitoring signal light is inserted after the signal light input port 1, and Switching means 19 is provided between the signal light monitor 18 and the optical switching means 11.
  • the signal light monitor 18 branches a part of the signal light input to the signal light input port 1, monitors the branched light with a light receiving element or the like, and checks the intensity of the wavelength-multiplexed signal light for each channel. Then, the intensity, the wavelength arrangement, the number of channels, and the like obtained by summing them are detected, and the detection result is output to the switching means 19 as an information signal.
  • the switching means 19 the information of the information signal input from the signal light monitor 18, the characteristics of the fiber grating 8a, 8b, 8c, 8d attached to the optical switching means 11 is shown By comparing with the database, etc., one of the four fiber gratings 8a, 8b, 8c, 8d, which is suitable for the input signal light at that time, 8a, 8b, 8 c, 8 d one ⁇ ? Based on this result, the switching of the optical switching means 11 is controlled so as to select an appropriate fiber grating 8a, 8b, 8c8d force based on the result.
  • the signal light monitor 18 may be provided at any position between the signal light input port 1 and the signal light output port 3.
  • FIG. 5 shows a fifth embodiment of the optical amplifier according to the present invention, which is an erbium-doped optical amplifier.
  • a four-port optical circuit 4 is inserted between the optical fibers 2a and 2b, and propagates through the erbium-doped optical fiber 2a to output the light input to the first port 5 from the second port 6.
  • the light input to the second port 6 is output from the third port 7, propagates to the erbium-doped optical fiber 2b, and further propagates through the erbium-doped optical fiber 2b to be input to the third boat.
  • Light is output from the fourth port 16 and light input to the fourth port 16 is output from the first port 5 so that the light can be transmitted to the erbium-doped optical fiber 2a. Things.
  • the second port 6 has a force for connecting a plating 8 that selectively reflects each wavelength light of the wavelength multiplexed signal light
  • the fourth port 16 has an erbium-doped light.
  • a fiber grating 17 for selectively reflecting the excitation light from the excitation light source 15 b propagated to the fa b is connected.
  • the excitation light from the excitation light source 15b is also propagated to the erbium-doped optical fiber 2a via the fiber grating 17 connected to the optical circuit 4 to excite the fiber 2a.
  • FIG. 6 shows a sixth embodiment of the optical amplifier according to the present invention, in which the pumping light of the pumping light source 15 is inputted from the signal light incident end side of the erbium-doped optical fiber 2 and the optical fiber 2 is pumped forward.
  • an optical circuit 4 is provided at the end of an erbium-doped optical fiber 2 for excitation. That is, the end of the erbium-doped optical fiber 2 is connected to the first port 5 of the optical circuit 4 and the signal light output port 3 is connected to the third port ⁇ of the optical circuit 4.
  • the wavelength-division multiplexed signal light that enters the first port 5 and is output to the second port 6 is reflected back by the reflection means 8, and is output from the third port 7 to the signal light output port 3.
  • the optical amplifier of the present invention may have the following configuration in addition to the above description.
  • an optical connector 12 may be used so that the optical switching means 11 can be detachably attached to the second port 6 of the optical circuit 4.
  • the fiber bug rating 8 can be exchanged for the entire optical switching means 11.
  • the fiber grating 8 connected to the second port 6 of the optical circuit 4 can have various desired characteristics, depending on the wavelength of the signal light, the number of multiplexed signal lights, the characteristics of the amplifier, etc. Thus, a material having a desired reflection wavelength and reflectance can be produced.
  • the optical amplifier according to the first or second aspect of the present invention it is possible to amplify a wavelength-division multiplexed signal without wavelength deviation by correcting wavelength dependency.
  • the attachment / detachment of the reflection means 8 is easy, so that, for example, even in a system in which the intensity deviation between signals fluctuates each time. By changing the reflection means 8, stable communication without intensity deviation can be performed.
  • a plurality of reflecting means 8 having characteristics deemed necessary can be attached in advance, and the switching is performed by the switching means 11. Since it is free, for example, even in a system in which the intensity deviation between signals fluctuates, it is possible to perform stable communication without intensity deviation by switching the reflection means 8 each time.
  • an appropriate reflection means 8 is automatically selected according to the characteristics of the input signal light, so that the characteristics of the input signal light are reduced. Automatic operation of the system is possible even in a changing system.
  • the switching means 11 can be easily attached and detached, and for example, even in a system in which the intensity deviation between signals varies. By switching or replacing the reflection means 8 each time, stable communication can be performed without any intensity deviation.
  • a switch is provided. Since at least one of the reflection means 8 connected to the port 10 of the tuning means 11 is different from the combination of the selected reflection wavelengths of the other reflection means, the communication channel may be changed. Can respond.
  • the reflection means 8 since the reflection means 8 employs a fiber bag rating, the degree of freedom in designing the reflection wavelength and the reflectance of the reflection means 8 is high, Products suitable for various systems can be easily manufactured.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

Un propagateur optique (4) est inséré au niveau d'une partie d'une fibre amplificateur optique (2). Des réflecteurs (8) équipent ce propagateur optique (4) de façon que la lumière multiplexée en longueur d'onde et fournie en entrée à la fibre optique amplificateur (2) soit soumise à la sélection de longueurs d'ondes de la part du réflecteur (8), soit atténuée de façon appropriée par la réflectance décidée pour chacune des longueurs d'ondes arrivant au réflecteur (8), soit amplifiée, puis remise en sortie par la fibre optique amplificateur (2) sous forme d'un signal lumineux ne présentant aucune variation d'intensité entre canaux.
PCT/JP1998/001488 1997-04-01 1998-03-31 Amplificateur optique WO1998044605A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002257097A CA2257097A1 (fr) 1997-04-01 1998-03-31 Amplificateur optique
EP98911143A EP0935320A1 (fr) 1997-04-01 1998-03-31 Amplificateur optique

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JP8304497 1997-04-01
JP9/83044 1997-04-01

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WO1998044605A1 true WO1998044605A1 (fr) 1998-10-08

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CA (1) CA2257097A1 (fr)
WO (1) WO1998044605A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
GB2345789A (en) * 1999-01-14 2000-07-19 Samsung Electronics Co Ltd Optical fibre amplifier having a separating unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100421135B1 (ko) 2002-03-11 2004-03-04 삼성전자주식회사 광대역 광섬유 증폭기
KR100419411B1 (ko) * 2002-03-19 2004-02-21 삼성전자주식회사 이득 평탄화 광섬유 증폭기

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS63241514A (ja) * 1987-03-28 1988-10-06 Furukawa Electric Co Ltd:The 光線路の切替え方法
JPH03206427A (ja) * 1990-01-08 1991-09-09 Mitsubishi Electric Corp ファイバ形光増幅器
JPH07336327A (ja) * 1994-06-07 1995-12-22 Nippon Telegr & Teleph Corp <Ntt> 透過型光フィルタおよび波長多重分離フィルタならびにリングレーザ
JPH0854580A (ja) * 1994-08-12 1996-02-27 Furukawa Electric Co Ltd:The 双方向光増幅器
JPH08213676A (ja) * 1994-11-16 1996-08-20 Oki Electric Ind Co Ltd 光ファイバ増幅器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63241514A (ja) * 1987-03-28 1988-10-06 Furukawa Electric Co Ltd:The 光線路の切替え方法
JPH03206427A (ja) * 1990-01-08 1991-09-09 Mitsubishi Electric Corp ファイバ形光増幅器
JPH07336327A (ja) * 1994-06-07 1995-12-22 Nippon Telegr & Teleph Corp <Ntt> 透過型光フィルタおよび波長多重分離フィルタならびにリングレーザ
JPH0854580A (ja) * 1994-08-12 1996-02-27 Furukawa Electric Co Ltd:The 双方向光増幅器
JPH08213676A (ja) * 1994-11-16 1996-08-20 Oki Electric Ind Co Ltd 光ファイバ増幅器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2345789A (en) * 1999-01-14 2000-07-19 Samsung Electronics Co Ltd Optical fibre amplifier having a separating unit
GB2345789B (en) * 1999-01-14 2002-01-16 Samsung Electronics Co Ltd Gain flattened optical fibre amplifier

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CA2257097A1 (fr) 1998-10-08
EP0935320A1 (fr) 1999-08-11

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